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Cross Plane 180 headers for GM LS V8

  1. Jun 25, 2014 #1
    I was looking into what cylinders need pairing to make a set 0f 180 headers for an LS V8 engine.
    When looking the pairings shown below.
    LS firing order 1-8-7-2-6-5-4-3
    Passenger (L) side = 1 3 5 7. Driver side (R) 2 4 6 8
    1-8-7-2-6-5-4-3
    L-R-L-R-R-L-R-L
    for a 4-1 header I get.
    1-7-6-4
    8-2-5-3
    AND for 4-2-1 180 - Was thinking the 1st pair would be short headers.
    1-7
    y-pipe > Left Out
    6-4

    8-2
    y-pipe > Right Out
    5-3

    However I noticed that if I just paired the cylinder ports (inner,outer) as follows I can 4 * 180 pairs as follows
    180 pairs into 4 pipes (Twin * 4)
    1-7 > out A/L
    5-3 > out A/R
    6-4 > out B/R
    8-2 > out B/L
    My question would the above arrangement still take advantage of resonance scavenging whilst avoiding the need for headers which link pair from opposite sides at expense of running 4 separate outlets at the rear (I quite like the idea of 4 outlets).
    What effect would it have on the exhaust note - would sound like 180 headers or some thing different from either a crossplane or flat-plane v8?
     
  2. jcsd
  3. Jul 5, 2014 #2
    The biggest issue is where the header collectors will fit and still leave you with optimum length and non-pinched turns.
     
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